.ntCheckbox {
  position: absolute;
  opacity: 0;
}
.ntCheckbox + label {
  position: relative;
  cursor: pointer;
  padding: 0;
}
.ntCheckbox + label:before {
  content: '';
  margin-left: 10px;
  display: inline-block;
  vertical-align: text-top;
  width: 20px;
  height: 20px;
  background: lightgray;
}
.ntCheckbox:hover + label:before {
  background: #f35429;
}
.ntCheckbox:focus + label:before {
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.12);
}
.ntCheckbox:checked + label:before {
  background: #f35429;
}
.ntCheckbox:disabled + label {
  color: #b8b8b8;
  cursor: auto;
}
.ntCheckbox:disabled + label:before {
  box-shadow: none;
  background: #ddd;
}
.ntCheckbox:checked + label:after {
  content: '';
  position: absolute;
  right: 13px;
  top: 9px;
  background: white;
  width: 2px;
  height: 2px;
  box-shadow: 2px 0 0 white, 4px 0 0 white, 4px -2px 0 white, 4px -4px 0 white, 4px -6px 0 white, 4px -8px 0 white;
  transform: rotate(45deg);
}